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Hello @Liam_1987
Welcome to the Bunnings Workshop community. It's sensational to have you join us and thanks for sharing your question about nut grass.
Nut Grass can be a real headache, especially in lawns and flower beds, because it spreads through underground tubers that keep coming back even after pulling it out. Since your lawn is Buffalo, you’ll need to be careful with what you use, as some herbicides can damage it. The best option available at Bunnings for Buffalo lawns is a selective herbicide like Amgrow Sedgehammer or similar products labelled safe for Buffalo. These are designed to target Nut Grass without harming the grass. When using it, make sure to follow the instructions carefully, applying it to actively growing Nut Grass for the best results.
In your flower bed, if the Nut Grass is popping up between plants, manual removal is possible, but you need to dig out the whole root system, including the nut-like tubers underground, or it will regrow. A non-selective herbicide like Roundup may work if applied carefully with a paintbrush directly to the Nut Grass leaves but keep it away from your flowers to prevent damage.
A good preventative step is to improve drainage and soil health because Nut Grass thrives in compacted or overly moist soil. Regular aeration in the lawn and adding organic matter like compost in the flower bed can help create conditions that make it harder for Nut Grass to spread. A thick, healthy Buffalo lawn also makes it more difficult for weeds to establish, so keeping it well-fed with a Buffalo-safe lawn fertiliser and mowing at the right height will help in the long run.
If you’re dealing with a serious infestation, a second herbicide treatment may be necessary after a few weeks, as Nut Grass is quite persistent.
Please remember to wear personal protection such as gloves, goggles and a mask when using chemicals. Make sure to follow all the safety guidelines printed at the back of the packaging.
If you need further assistance, please let us know.
Eric
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